Why does ductile column fails in axial load in RCDC where same column with lesser size under same loading and moments if designed as regular passes the design. why?
Hias per IS 13920-2016, 7.1 axial stress in column due to all load combinations should not exceeds 0.4 fck. The ductile detailing clauses are applicable only if axial stress are less than 0.4 fck. refer below snap,
So, if axial stress exceeds 0.4 fck, RCDC shows failure in axial stress in column. I would suggest you to increase concrete grade Or increase column size to pass this check.
Does ductile detailing have any effect on longitudinal reinforcement?
Hithere is no impact on longitudinal reinforcement in column for ductile detailing. please read IS 13920-2016 for more details.